Quote:
Originally Posted by Emily Brent
I identify as igneous
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Volcanic or plutonic? Felsic, mafic, or intermediate? If volcanic: lava, ash layers, or compacted mixed pyroclastic materials? If plutonic: what is your closest metamorphic rock?
The answers to these questions will help me to address you properly. I would never address obsidian in the same way I approach rhyolitic tuff, or a granite pegmatite.